G5246
ὑπέρογκος
boastful
ὑπέρ-ογκος, -ον [in LXX: Deu.30:11 (פָּלָא), etc. ;] of excessive weight or size; metaphorically, excessive, immoderate, in late writers, of arrogant speech (see Mayor on Ju, l.with): n. pl., 2Pe.2:18, Ju 16.† (AS)
The KJV translates G5246 in the following manner:
swelling (4x)
Full Thayer's lexicon entry
ὑπέρογκος — hypéronkos
ὑπέρογκος, ὑπέρογκον (ὑπέρ, and ὄγκος a swelling), oversollen; metaphorically, immoderate, extravagant: λαλεῖν, φθέγγεσθαι, ὑπέρογκα (A. V. great swelling words) expressive of arrogance, Jud 1:16; 2Pe 2:18; with ἐπί τόν Θεόν added, Dan 11:36, Theod., cf. the Sept. Exo 18:22; Exo 18:26. (Xenophon, Plato, Josephus, Plutarch, Lucian, Aelian, Arrian.)
2 occurrences
II Peter (1), Jude (1)